Fibe-box inneb casing



July 26, 1927.

O. A. TOFFTEEN FIRE BOX INNER CASING Filed Nov. 5, 1925 0000000 ooOoOfloOOnqa-Q a ecouencuaennononooooo 020 f /1.Toff 06m Patented July 26,1927. 7 I g 7 1,636,761 warren STATESPATENT. OFFICE.

OLOF A; TOFFTEEN, OF CHICAGO, ILLINOIS.

FIRE-BOX INNER CASING;

Application filed November 5, 1925. Serial No. 66,918.

This invention relates more particularly to an inner casing or oven adapted to be positioned within a boiler fire box to sur round an oil burner nozzle and afford a combustion chamber positioned to direct flames against an apertured fire arch also positioned within the fire box ina position to coact with said inner casing to afford a circuitous pathway for the flames of combustion through the fire box of the boiler.

It is an object of this invention to provide a partitioned hollow auxiliary housing or casing within a boiler fire box around an oil burner nozzle.

It is also an object of this invention to provide a boiler fire box with a hollow auxiliary oven' or housing surrounding a fuel supply a plurality of currents of air into SZLIC auxiliary housing to be'carbureted with the fuel to formfiames which are adapted to'be guided through the fire box by means of the auxiliary housing and a fire arch associated therewith.

It is an important object of this invention to provide a boiler fire box with a hollow partitioned auxiliary housing or oven constrructed of a carborundum product or of. fused silicon carbide, said auxiliary housing adapted to surround a burner and fur thermore having adjustable means whereby an additional draft of air may be established through an entrance opening in said auxiliary housing.

Other and further. important objects of this invention will be apparent from the disclosures inv the specification and accom panying drawings.

The invention (in a preferred form) is illustrated in the drawings and hereinafter more fully described.

On thedrawings: v V Figure 1 is a fragmentary interior 'V1GW' of a boiler fire box illustrating a pair inner casings or ovens embodying the principles of this invention and showing one o said inner casings in section.

Figure 2 is a vertical central section taken longitudinally through the fire box on line 1 with parts broken away. detail section Figure 3 is a fragmentary taken on line of the inner casing or oven TIL-III of Figure 2. v

As shown on the draw ngs:

The reference numeral lindicates a boiler fire box having'a front door 2 and a plunozzle and constructed to supply l 1 PIOJects. A fuel distributer or oil nozzle f ber 22 and the front side wall rality of fines or pipes 3. The fire box 1 1s provlded with a grate l-upon which is mounted a fire arch constructed of a carborundum. product or fused silicon carbide and consisting of a hollow vertical wall 5 and an upwardly and forwardly inclined hollow top wall 6 having a plurality of air outlet or supply apertures? in the bottom 'wall thereof and a plurality of end apertures 8. The fire arch 56 is positioned near the rear end of the fire box and extends transversely thereacross. I

Positioned upon the fire grate #tis an im proved inner casing or ovenconstructed of carborundum or of fused silicon carbide and embracing a hollow frontwall 9 pro vided with an arched opening or doorway 10 through which an oil or fuel supply pipe 12 is mounted on the inner endofthe fuel supply pipe 11. Mounted on the front face of the front wall 9 are a pair of guides 13' around the fuel supply pipe 11 when said doors are intheir closed positions. Connected with the upper edge of the front wall 9 is a hollow top wall 16 closed at its rear end. The top wall '16 is supported atboth sides by a pair of hollow side walls 17 which are closed at their rear ends. Positioned within each of the hollow walls 17 is an upright partition 18 which extends from the fire grate 1 to within a short distance of the top wall 16. The partition 18 divides the interior of each ofthe side walls into a front chamber 19 and a rear chamber 20. The lower end of each of the front chambers 19 of the side walls isclosed by means of a bottom partition or, plate 21. Both of the chambers 19 and 20 of each side wall comf municate at their upper ends with the chamber 22 in the top wall. The top wall chamchambers 19 communicate -with the chamber .23 of the front wall 9. The casing walls 9, 16 and 17 afford acombustion chamber 24; within the inner casing or oven, said combustion chamher being open at theIrearend to permit escape of the flames against the vertical wall 5 of thefire arcln The fire arch acts to'direct the flames upwardly in a circuitous path through the boiler fire box.

- v A liquid fuel is supplied: through the fuel supply pipe 11 which projects though the front opening or entrance 10 of the inner casing or oven. The fuel oil is adapted to be distributed and fed into the combustion chamber 24 by means of the, fuel supply nozzle 12. Air is supplied to the combustion chamber 24 through the fire grate l and is also supplied through the entrance opening 10 by a current of air which passes upwardly from the fire grate into the rear chambers 20 of the side walls and then passes into the top chamber 22 and over the upper ends of the side wall partitions 18 into the front side wall chambers 19? Air from the top wall chamber 20 and from the front side wall chambers 19 is thus permitted to enter the front wall chamber 23 and pass inwardly through the opening 10 into the combustion chamber 24: around the fuel supply nozzle 12. The different currents of air entering the combustion chamber 24: are thus carbureted with fuel from the fuel burner or nozzle 12 to produce a fuel mixture which is adapted to be readily ignited due to the fact that the auxiliary streams of air en tering the front end of the combustion chamber 24L from the hollow chambers 22, 19 and 23 of the inner casing are heated. When an additional quantity of air is desired to pass through the combustion chamber 24; the upper closure plate or door 15 may be adjusted to permit air from below to pass upwardly through the fire grate between the door sections 14 and 15 and through the entrance opening 10 of the front wall of the inner casing. It will thus be seen that the improved hollow inner casing or oven is adapted to provide an arrangement whereby both cold air and superheated air may be admitted into the combustion chamber 24: to be carbureted with fuel from the nozzle 12. The fuel mixture when ignited pro duces extremely hot flames which are permitted to escape through the open rear end of the combustion chamber 2 1 and strike against the hollow upright wall 5 of the fire arch. This wall acts to direct the flames upwardly so that they will pass forwardly arch wall 6 and are then directed rearwardly so that they will pass between the fines or pipes 3 of the boilers.

As illustrated in Figure 1 a plurality of improved inner casings or ovens may be positioned adjacent one another within the fire box upon the boiler grate 4. The inner casing s 0-1: even meetin with the fa e area 5--6 thus afford an improved means where-.

by flames of intense heat may be circulated through a circuitous path in the boiler fire box to cause heating of the boiler tubes or pipes I am aware that many changes may be .made and numerous details of construction ing hollow walls, means for adjustably closing one end of the casing and a fuel supply device projecting into said fire box and into said inner casing to supply fuel to the interior of said inner casing for ,carburization with pro-heated air issuing from said hollow casing walls and with the air entering the fire box below said inner casing.

2. The combination with a boiler fire box, of an inner casing spaced from the front .wall of the fire box and constructed of fused silicon carbide and comprising hollow side walls closed at the rear ends, ahollow top wall closed at the rear end, and hollow front wall, said hollow front wall having an opening therein, and adjustable means for closing said opening.

3. The combination witha boiler fire box, .of an inner casing comprising hollow top, side and front walls, said top and side walls closed at their rear ends, partitions-in said hollow side walls to divide the same into a plurality of chambers, said front wall having an opening therein, adjustable means for closing said opening, a fuel supply pipe pro ecting into the fire box and into said casing through said adjustable means, and

a fuel supply nozzle on the inner end of said fuel supply pipe within said inner casing. p

4. A fire box inner casing comprising a hollow top wall closed at its rear end, a hollow front wall having an entrance opening therein, hollow side walls connected with said hollow top wall andwith said front wall and closed at their rear ends, partitions in said hollow side walls,'guides on said hollow front wall, slidable means in said guides controlling the supply of air through said front wall opening, and fuel supply means projecting through said slidable means and front wall opening into the inner casing.

5; The combination with a boiler fire box, of a fuel supply nozzle projecting therein, chambered casing mounted within said.

7 adjustable with fire box and spaced from the front wall thereof and enclosing said fuel supply nozale, said inner casing being open at its rear end and having an opening in the front Wall thereof, guides on said front wall, and partitions in said guides for closing said front wall opening, with vone of said partitions respect to the other;

6. The combination with a fire box and fire grate thereof, of an inner casing mounted on said fire grate and comprising ,I hollow side walls closed vat their rear ends,

a hollow top wall closed at its rear end, and a hollow front wall, said front wall having an entrance opening therein, adjustable means for closing said entrance opening, fuel supply means projecting through said opening into said casing justable means, and vertical and horizontal between said ad partitions in said hollow side walls for dividing the same into a plurality of chambers.

7. The combination with a fire box and a fire arch therein, of an inner casing mounted in said fire box between the fire archand the front wall of the fire box and spaced from both the fire arch and said front wall, said inner casing being constructedof a refractory material having hollow walls, angled partitions within certain of said walls, and a fuel supply device projecting into the fire box and into said inner casing, said innor casin'g being open at both ends and at the bottom, and adjustable means for controlling the opening at one end of said cas mg.

In testimony whereof I have hereunto subscribed my name.

OLOF A. TOFFTEEN. 

